package com.example.bookstore.component;

import com.example.bookstore.common.utils.JwtTokenUtil;
import com.example.bookstore.common.utils.JwtTokenUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author: rain
 * @date: 2020/4/26 13:01
 * @description:
 */
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    private static final Logger LOGGER = LoggerFactory.getLogger(JwtAuthenticationTokenFilter.class);

    @Autowired
    private UserDetailsService userDetailsService;

    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @Value("${jwt.tokenHeader}")
    private String tokenHeader;

    @Value("${jwt.tokenHead}")
    private String tokenHead;

    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
         String authHeader = httpServletRequest.getHeader(this.tokenHead);

         if(authHeader!=null&&authHeader.startsWith(this.tokenHead)){
             String authToken = authHeader.substring(this.tokenHead.length());
             String username = jwtTokenUtil.getUserNameFromToken(authToken);
             LOGGER.info("checking username:{}",username);
             if(username!=null&&SecurityContextHolder.getContext().getAuthentication()==null)
             {
                 UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
                 if(jwtTokenUtil.validateToken(authToken,userDetails)){
                     UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(userDetails,null,userDetails.getAuthorities());
                     authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(httpServletRequest));
                     LOGGER.info("authenticated user:{}",username);
                     SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                 }
             }
         }
         filterChain.doFilter(httpServletRequest,httpServletResponse);
    }

}
